Door-lock



(No Model.) R. G. ROLAND.

DOOR LOOK.

PatentedApr. 28, 1885.

Rm m ih ATTO NBY- Warren STATES ROBERT G. ROLAND, OF BEECH GROVE,KENTUCKY.

DOOR-LOCK.

SPECIFICATION forming part of Letters Patent No. 316,574, dated April 2318815.

(No model.)

To all whom, it may concern:

Be it known that I, ROBERT G. ROLAND, a citizen of the United States,residing at Beech Grove, in the county of McLean and State of Kentucky,have invented certain new and useful Improvements in Door'Locks; and Ido declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had tothe'accompanying drawings,.and tothe letters and figures of referencemarked thereon, which form a part of this specification.

My invention relates to door-locks; and the novelty consists in theconstruction, arrangement, and adaptation of parts, as willbe more fullyhereinafter set forth, and specifically pointed out in the claims.

The essential object of the invention is to provide a lock and apeculiar key therefor which shall be inexpensive of construction, simplein operation, not liable to get out of order, and which shall beeflicientin preventing evil-disposed persons from tampering with thebolt.

To these ends it consists, essentially, in a body in a recess of whichis housed a single bolt. This bolt has two recesses, in which the end ofa single spring operates to lock the bolt either in a projected positioninto engagement with the keeper or in its withdrawn position within thelock. The key is cylindrical and carries a pivoted arm which operatesthe bolt. The arm is pressed within the shank of the key when the key isinserted into the lock, and a spring operates to throw the arm outward.The back plate of the lock has a slot through which the key-arm passes,and as the key is partly withdrawn this key-arm falls into position tooperate the bolt and the boltspring. Spring-shields pivoted upon theouter face of the back plate serve to close the keyhole, except whenthey are forced apart by the sharpened point of the key, and ahookserves to lock these together when it is desired to lock the door uponthe inside. When it is desired to remove the key, the said key is forcedinward until the arm passes entirely through the back plate, when aquarter-turn of the key will bring the said arm against a lug or guardand within the plane of the key, and the key may be readily withdrawn.

The invention is illustrated in the accompanying drawings, which form apart of this specification, and in whichi Figure 1 is a cross-section ofthe look through the line :0 m, Fig. 2. Fig. 2 is a plan view thereofwith the back plate removed. Fig. 3 is a back plan View with the'backplate in posit-ion. Fig. 4c is a detail view of the key, and Fig. 5 adetail view of the key-clos ing guard.

Referring to the drawings, in which similar letters of referenceindicate like parts in all the figures, A designates the body of thelock, to which is secured a back plate, B, and between which is formedand located the springreeess a and the boltway a. One end of the spring0 has a bearing in slit a of the body,

and the opposite end, 0, operates in a recess,

(1, of the bolt D to lock the said bolt into e11- gagement with thekeeper, (not shown,) or into the recess d, to lock said bolt in itswithdrawn position.

The key-hole of the lock is designated by the letter a, and it iscontinuous through the body and back plate, B.

Pivoted to the outer face of the back plate, B, is a pair of guards, F,a spring,f, operating to hold them together with their contiguous edgesover the plane of the key-hole, and a slot, b, in the plate B extendsupon either side of the keyhole in that portion.

K designates the shank of the key, which is circular in cross-section,and has a sharpened or conical point, it. In a longitudinal slot in thesaid shank is pivoted an arm, L, in such a manner as to present a longend, 1, and a short end, Z. A spring, M, is located within the slot andserves by its spring force to throw the longer end of the arm toward thepointof the key after said end has been pulled back preparatory toinserting the key in the lock. Upon the guards F are secured a hook, s,and an eye, 8, by means of which the said guards may be securedtogether, and this aetion,it will be observed,serv.es to lock the en'-tire device against the action of the key.

Upon one of the guards F contiguous to the end of the arm L in thedirection of the pot-nt poses of this description will beassumedtobe.with the guards close together, but not locked,

with the bolt withdrawn, and with the longer of the key-shank. Theoperator pulls the longer end, I, of the arm L back against the actionof the spring M and inserts the keyi nto the hole (1 forcing it entirelythrough the back plate, B. As soon as the arm L is clear of the backplate the action of the spring lyI' throws the longer end outward. Thekey :being then partially withdrawn said :arm bearsagainst 'theguardsFand is forced to :assume' a .position at rightangles to the :plane ofthe :key-shank-and parallel with the plane of the back plate. A slightoscillation of itheikey will then make the arm L register with the slotD, and :the key being furth-e-r withdrawn I the said-arm'drops into thechamber -a with the longer end lying intthe direction of the bolt{IQ-and the shorter end lying .in (the vdi- I rection of the spring 0.A-sithus conditioned, the key being turned in the proper-zdiiine'ction,

from the recess id of the bolt.

inward until the arm :L has passed beyond the back;plate,B, turn'the keyuntilthe-s'hort end, :Z, comes into contact with the lug z, =when .aiproper manipulation will bring the :arm L within the :planeof'the'ekey'andiit mayireadily be withdrawn.

I attach importance to the construction and operation of thekeyinits.relationitothesin- .gle bolt-and single spring.

I I also attach importance to the guardsand their concomitant "parts,and to the lug z for withdrawing :the

a-nnwithin the body of the .:key.

Modificationsin details ofconstruction may be made without departingfrom the principle or sacrificing the advantages of my invention, theessential features of which will be readily understood from theforegoing description, taken in connection with the drawings.

"The lug 2 maybe formed with an inclined face, the contact of which withthe arm Lwill TSBIVB illO force it within the slot of the key.

Having thus described theinvention, what I claim as new, and desire tosecure by Letters Patentof the UnitedStates, is

1. The combination, with aloek-case, as described,and-with a bolt, D,having recesses d d and spring 0, of a key having a pivotedspring-actuated arm, L, ha-v-ing vasshortiend, .l, adapted to firstunlock the spring from .the bolt, and:a longer end, IZ, adapted tooperate the bolt by the same movement of the key, :as set forth. I

:2. 'The combination of thezboltandisprnim'g anditheguards 13, havingspring fand lugz, wv-ith inclined face secured upon one :of said guards,with the :key ihaving conical point. and pivoted :and spring-actuatedarm L, .as sand -for rthe purposes set forth. f3. 'The combina'tion,with the ibod y A, ing recesses a a"a the plate B, haviingssl'otsb, .theguards F, spring f, and lug z, the bolt 19.,

sandspniing O, oflthe keyhaving conical point an'dl-the pivoted andspring-actuated anmL, :as set forth.

4. The eom'binatiomwith alock-case having a cylindrical key-hole and a=SlOl],b,U :l1 fih'e ibackiplataofia key having.aslottedeylindrficals'hanfk .and :api voted spring-actuated arm, EL, aa=bolt, ill-landspring (3, and a lug, z, :lyingadjacen't to the slot 1), itheiwholeadapted flso serve as and :for the-p urposes set forth.

Intestimony whereof I affix myrsignatuureiiin presence of two witnesses.

FRGJIBERT G. Witnesses: l

{GRAND-ELL, M. G. .AsrrBY.

